All Questions
11
questions
3
votes
2
answers
60
views
Why don't hovercrafts move West relative to the Earth [duplicate]
Suppose that there is a hovercraft floating a few centimetres above the Earth's surface. As it is disconnected from the Earth, which is spinning from West to East, shouldn't it appear to move East to ...
- 363
2
votes
1
answer
116
views
Why ball fall at same location from where we throw it? [duplicate]
I have a silly question. As we all know earth is rotates at a speed of 460 m per sec. So if I throw a ball in the air for 10 sec than the ball must fall 4600 m away from me but these does not happen ...
- 21
0
votes
1
answer
140
views
Can we move without moving? [duplicate]
So here is the question,
If I jump and hover over the ground for sometime why don't we move away from the point I jumped from? Because earth is rotating so if I hover long enough we should move from ...
- 13
0
votes
1
answer
238
views
How would one compute the path of an particle's motion from forces defined in different frames of reference?
I'm trying to write a computer program to render and play-back the path of a particle existing in 2D space given all forces acting on said particle. This is relatively easy to do if all forces are ...
0
votes
3
answers
2k
views
Explain the relative motion between two particles of a rotating rigid body
A rigid body is defined as a collection of particles in which distance between each pair of particles remains constant.
I was taught that the motion of any one particle of the rigid body with respect ...
- 103
1
vote
2
answers
147
views
Relativity of velocity while riding a bike
I was trying to think of a situation in which an observer would be able to determine whether he is moving or not. Since velocity is a relative quantity I was unable to do so.
However, consider a ...
- 444
1
vote
2
answers
2k
views
Directions of static & kinetic friction?
Static friction :
Static friction opposes relative motion between two surfaces. The car is moving at some tangential velocity relative to the road. Thus, static friction should act in the opposite ...
- 27
4
votes
1
answer
2k
views
Angular momentum about a moving point
I was used to see the Angular Momentum Principle as:
$\dot{\underline{H}_O} = \underline{M}_O^{ext}$
that is, the change in angular momentum equates the external torque w.r.t. a point $O$.
Now, I'...
- 143
1
vote
1
answer
120
views
Centrifugal force in inertial systems
My textbook gives an example:
There are two systems, $O$ is inertial and $O'$ non inertial. $O'$ is rotating whit $\omega=\mathrm{constant}$ and $O=O'$.
We assume that a disc is rotating whit the ...
- 165
-1
votes
2
answers
58
views
Velocity as viewed from space
I got a problem which asks if the speed of a car in Oslo is 50km/hr what will be its speed when viewed from space.
I have the relation between the velocities as observed from inertial and non-...
0
votes
1
answer
2k
views
Since Earth spins, would an aircraft travelling opposite to direction of Earth spin take less time? [duplicate]
Suppose we want to reach the point on earth which in relative terms is exactly on the opposite end of the sphere we call earth (I know it is not an exact sphere).
We either dig vertically downwards, ...
- 407